Exercise device



FIG. 1 is perspective view;

FIG. 2 is a bottom plan view;

FIG. 3 is a top plan view;

FIG. 4 is a front elevational view;

FIG. 5 is a rear elevational view; and,

FIG. 6 is a right side elevational view thereof, wherein the left side view is a mirror image. 

The ornamental design for an exercise device, as shown. 